]> git.proxmox.com Git - mirror_ubuntu-eoan-kernel.git/commit
of: add helper to lookup compatible child node
authorJohan Hovold <johan@kernel.org>
Mon, 27 Aug 2018 08:21:45 +0000 (10:21 +0200)
committerRob Herring <robh@kernel.org>
Wed, 29 Aug 2018 13:06:46 +0000 (08:06 -0500)
commit36156f9241cb0f9e37d998052873ca7501ad4b36
tree203d1e52a9e5a942a2b99ae0ecb984fa87453df8
parent5b394b2ddf0347bef56e50c69a58773c94343ff3
of: add helper to lookup compatible child node

Add of_get_compatible_child() helper that can be used to lookup
compatible child nodes.

Several drivers currently use of_find_compatible_node() to lookup child
nodes while failing to notice that the of_find_ functions search the
entire tree depth-first (from a given start node) and therefore can
match unrelated nodes. The fact that these functions also drop a
reference to the node they start searching from (e.g. the parent node)
is typically also overlooked, something which can lead to use-after-free
bugs.

Signed-off-by: Johan Hovold <johan@kernel.org>
Signed-off-by: Rob Herring <robh@kernel.org>
drivers/of/base.c
include/linux/of.h